Abstract: To study the characteristic of chlorine corrosion on boiler heating surface due to co-firing of biomass and coal, simulation tests were carried out in a tube furnace using weight gain method under different gaseous and ash deposition conditions, so as to obtain the corrosion behavior for different tube materials, HCl concentrations and at different temperatures. Results show that the characteristic curves of chlorine corrosion on all the metals follow the parabola regularity, and 15CrMoG tube has better corrosion resistance than 12CrMoVG tube; the corrosion rate has a linear relationship with the HCl concentration, and alkali chloride is more corrosive than HCl to above materials; the corrosion rate has an exponential relationship with temperature, which increases rapidly with the rise of temperature from 550 ℃ to 600 ℃.